export function copyObject (obj) {
  return JSON.parse(JSON.stringify(obj))
}

export function object2QueryStr (object) {
  const strList = []
  Object.keys(object).forEach(key => {
    const val = object[key]
    if (val && val !== '') {
      strList.push(`${key}=${val}`)
    }
  })
  return strList.join('&')
}

export function formatObjectEmpty (object) {
  if (object !== null && object !== undefined && !(object instanceof Array) && object.constructor === Object) {
    let p
    for (p in object) {
      // eslint-disable-next-line no-prototype-builtins
      if (object.hasOwnProperty(p)) {
        const value = object[p]
        if (value === undefined || value === null) {
          delete object[p]
          continue
        }
        object[p] = formatObjectEmpty(value)
      }
    }
  }
  return object
}

export function downLoadFile (url) {
  const a = document.createElement('a')
  a.target = '_blank'
  a.href = url
  a.click()
}

/**
* Parse the time to string
* @param {(Object|string|number)} time
* @param {string} cFormat
* @returns {string}
*/
export function parseTime (time, cFormat) {
  if (time == null) return null

  if (arguments.length === 0) {
    return null
  }
  const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'
  let date
  if (typeof time === 'object') {
    date = time
  } else {
    if ((typeof time === 'string') && (/^[0-9]+$/.test(time))) {
      time = parseInt(time)
    }
    if ((typeof time === 'number') && (time.toString().length === 10)) {
      time = time * 1000
    }
    date = new Date(time)
  }
  const formatObj = {
    y: date.getFullYear(),
    m: date.getMonth() + 1,
    d: date.getDate(),
    h: date.getHours(),
    i: date.getMinutes(),
    s: date.getSeconds(),
    a: date.getDay(),
  }
  const timeStr = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
    let value = formatObj[key]
    // Note: getDay() returns 0 on Sunday
    if (key === 'a') { return ['日', '一', '二', '三', '四', '五', '六'][value] }
    if (result.length > 0 && value < 10) {
      value = '0' + value
    }
    return value || 0
  })
  return timeStr
}
